9v motor dies after running for 2-3 mini

[Chris Stransky]

I have recently started trying to use a Lego 9v motor on metal track to run trains. I use a MRC 1400 power pack and speaker wire to get power to track. The track is an oval with the round ends being brand new FX Bricks R56 curves. The straight sections are used track with three sections on each side.  They looked like they are in good shape. No green corrosion and I wiped them down with alcohol before assembly. I verified that electrical to the track is working with a multimeter. The train will start to run but after 10 or so laps the motor slows to a stop and won’t run. The motor was supposedly new/.unused original Lego and looked that way when I got it. Any ideas what my issue might be?  This is my first experience with rail powered Lego motors and i was expecting it would either work or it wouldn’t. Kind of surprise at the behavior. 

[Toastie]

Welcome to EB!

Does the train run again, after some motor cool-off time? Maybe an hour or so? Or is it entirely dead?

Best
Thorsten